/*
 * Copyright 2018 Spotify AB.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing,
 * software distributed under the License is distributed on an
 * "AS IS" BASIS, WITHOUT WARRANTIES OR CONDITIONS OF ANY
 * KIND, either express or implied.  See the License for the
 * specific language governing permissions and limitations
 * under the License.
 */

package com.spotify.scio.coders.instances.kryo

import com.esotericsoftware.kryo.Kryo
import com.esotericsoftware.kryo.io.{Input, Output}
import com.google.protobuf.ByteString
import com.twitter.chill.KSerializer

private[coders] class ByteStringSerializer extends KSerializer[ByteString] {
  override def read(kryo: Kryo, input: Input, tpe: Class[ByteString]): ByteString = {
    val n = input.readInt()
    ByteString.copyFrom(input.readBytes(n))
  }

  override def write(kryo: Kryo, output: Output, byteStr: ByteString): Unit = {
    val len = byteStr.size
    output.writeInt(len)
    val bytes = byteStr.iterator
    while (bytes.hasNext) {
      output.write(bytes.nextByte())
    }
  }
}
